7949785817 has 2 divisors, whose sum is σ = 7949785818. Its totient is φ = 7949785816.

The previous prime is 7949785771. The next prime is 7949785819. The reversal of 7949785817 is 7185879497.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7315551961 + 634233856 = 85531^2 + 25184^2 .

It is a cyclic number.

It is not a de Polignac number, because 7949785817 - 2¹⁰ = 7949784793 is a prime.

Together with 7949785819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7949785819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3974892908 + 3974892909.

It is an arithmetic number, because the mean of its divisors is an integer number (3974892909).

Almost surely, 2^7949785817 is an apocalyptic number.

It is an amenable number.

7949785817 is a deficient number, since it is larger than the sum of its proper divisors (1).

7949785817 is an equidigital number, since it uses as much as digits as its factorization.

7949785817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35562240, while the sum is 65.

The square root of 7949785817 is about 89161.5714139225. The cubic root of 7949785817 is about 1995.8066990079.

The spelling of 7949785817 in words is "seven billion, nine hundred forty-nine million, seven hundred eighty-five thousand, eight hundred seventeen".